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Re: Problem of converting plots with both plotimage and multiplot to postscript [message #86071 is a reply to message #86069]

Mon, 30 September 2013 05:52

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

jeffreyrdcs@gmail.com writes:

> I was trying to plot some fits images using a combination plotimage.pro and multiplot.pro, it appears fine on my screen as well as output as PNG using write_png.pro. Below is what it look like when I export the plot as PNG:
>
> http://i.imgur.com/XKYK8mX.png
>
> But when I export it to PostScript, after conversion it appears to be something like this:
>
> http://i.imgur.com/b2CfdF5.png
>
> As you can see there's weird pixels plotted on my PS. I set it in IDL like this:
>
> set_plot,'ps'
> !p.font=0
> device,filename= outfile,$
> xsize= some number,$
> ysize= some number,$
> /encapsulate
>
> multiplot,[0,3,6,0,0],xxxxxxx
> ....
> plotimage, xxxx
> ....
> multiplot,/reset
>
> and of course, device,/close at the bottom.
>
> It happens when I run my code on either my Linux machine or my Mac. I have never encountered such a problem when I plot postscript using plotimage nor multiplot before

It results from using indexed color in your PostScript device. Your
color table is being contaminated, probably from the labels you are
writing on your images. Setting your PostScript device up correctly is
handled for you if you use PS_Start/PS_End to configure the device, or
you can probably just include a DECOMPOSED=1 keyword on your Device
command to clear this up.

Cheers,

David

--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.idlcoyote.com/
Sepore ma de ni thue. ("Perhaps thou speakest truth.")

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[Message index]

		Problem of converting plots with both plotimage and multiplot to postscript By: Jeffrey Chan on Mon, 30 September 2013 03:21
		Re: Problem of converting plots with both plotimage and multiplot to postscript By: David Fanning on Mon, 30 September 2013 05:52
		Re: Problem of converting plots with both plotimage and multiplot to postscript By: Jeffrey Chan on Mon, 30 September 2013 12:42
		Re: Problem of converting plots with both plotimage and multiplot to postscript By: David Fanning on Mon, 30 September 2013 05:55

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